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Neuropharmacol 14 (8), 857865

15% NIACINAMIDE + VITAMIN C DARK SPOT CORRECTOR FOR GLASS SKIN : Clinically proven formula with high-concentration niacinamide and vitamin C capsules for visible dark spot reduction and hyperpigmentation correction in 3 days

I could only find one reference to excessive Vitamin B12 being linked to blood clotting, on a website belonging to what looks like a private Vietnamese hospital chain

[link] Montoya DJ, Andrade P, Silva BJA, Teles RMB, Ma F, Bryson B, Sadanand S, Noel T, Lu J, Sarno E, Arnvig KB, Young D, Lahiri R, Williams DL, Fortune S, Bloom BR, Pellegrini M, Modlin RL., "Dual RNA-Seq of Human Leprosy Lesions Identifies Bacterial Determinants Linked to Host Immune Response", Cell Rep 26 (13): 3574-3585 (2019)

doi: 10.1016/j.intimp.2020.106357 48 SanmarcoLMChaoCCWangYCKenisonJELiZRoneJMet al